Sunday, May 13, 2018

Another correction

‘In the period 1940-41 the cipher research
department of the German Army’s signal intelligence agency Inspectorate 7/VI
had several talented mathematicians (Pietsch,
Steinberg, Marquart, Schulz, Rinow)
tasked with examining difficult foreign cryptosystems. The war diary of Inspectorate
7/VI shows that these individuals investigated the Typex device and by May ’41
had ascertained that it was mainly used by the RAF and was issued with 10
rotors. Their research on its internal cipher operation however was slow and
had not led to any breakthrough. Things changed in May when they visited the
facilities of the Signal Intelligence Agency of the Supreme Command of the
Armed Forces - OKW/Chi and were able to examine a Typex machine captured
at Dunkirk.
The device worked according to the Enigma principle with the two rotors on the
left remaining stationary and the wiring of the entry and reflector wheels
could be recovered’

into

‘In the period 1940-41 the cipher research department of the German
Army’s signal intelligence agency Inspectorate 7/VI had several talented
mathematicians (Pietsch,
Steinberg, Marquart, Schulz, Rinow) tasked with
examining difficult foreign cryptosystems. The
war diary of Inspectorate 7/VI shows that these individuals investigated the
Typex device and by May ’41 had ascertained that it was an Enigma type
device with 5 multistep rotors, the last two of which did not move during
encipherment. Their research was confirmed in May, when they visited the
facilities of the Signal Intelligence Agency of the Supreme Command
of the Armed Forces - OKW/Chi and were able to examine a Typex machine
captured at Dunkirk.
The device worked according to the Enigma principle with the two rotors on the
left remaining stationary and the wiring of the entry and reflector wheels
could be recovered’.